Preheat the oven to 350℉. Line a 12-cavity muffin pan with paper liners. Set aside for later.
In a small mixing bowl, whisk together the milk, egg, sugar, oil, and vanilla extract until combined. Set aside.
In a larger mixing bowl, whisk together the flour, chocolate chips, baking powder, and salt until combined.
Pour the wet ingredients into the dry ingredients and gently mix together, until combined.
Evenly divide the muffin batter between the 12 muffin cups. Each cup will be almost full.
Bake for 23-28 minutes or until the muffin tops are golden brown and domed shaped.
Let cool for 10 minutes and serve!